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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Related Party Transactions [Abstract] |  |  |  |
Management fee | $ 295,748 us-gaap_ManagementFeeExpense | [1] | $ 240,964 us-gaap_ManagementFeeExpense | [1]
Credit from voluntary, irrevocable waiver by Adviser's board of directors | (320,905)land_RelatedPartyTransactionCreditFromVoluntaryIrrevocable | [1] |  |
Net fee to our Adviser | (25,157)land_ManagementFeeExpenseNetOfCreditToIncentiveFee |  | 240,964 land_ManagementFeeExpenseNetOfCreditToIncentiveFee |
Administration fee | $ 130,936 land_AdministrationFee | [1] | $ 66,158 land_AdministrationFee | [1]
[1] | Refer to Note 4, "Related-Party Transactions," for additional information.

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- Definition Administration fee. + References No definition available. + Details
Name: | land_AdministrationFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Management fee expense net of credit to incentive fee. + References No definition available. + Details
Name: | land_ManagementFeeExpenseNetOfCreditToIncentiveFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction credit from voluntary irrevocable. + References No definition available. + Details
Name: | land_RelatedPartyTransactionCreditFromVoluntaryIrrevocable
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_ManagementFeeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration